JP4794150B2 - Work mounting jig and welding method using the same - Google Patents

Description

  The present invention relates to a workpiece mounting jig that can easily determine a central axis when a workpiece to be welded is fixed to a positioner, and a welding method having a wide application range using the workpiece mounting jig.

  For example, Japanese Patent Laid-Open No. 5-318109 is known as a related art relating to a restraining jig used when a workpiece to be automatically welded is fixed to a rotary positioner. This prior art is made for the purpose of providing a workpiece restraining jig capable of welding various workpieces having different welded joints by one type of welding system.

  FIG. 17 (a) is a front view showing a rotating frame portion of the rotary positioner in the prior art, and FIG. 17 (b) is a partially enlarged perspective view of FIG. 17 (a). 17 (a) and 17 (b), this rotational positioner is a rotational positioner that clamps the SRC column from the outside. The rotational positioner is usually provided with a pair of frame bodies 110. A rotating frame 111 is supported at the center via a guide roller 112. A gear portion 111a is formed on the outer periphery of the rotating frame 111, and a pinion 113 that meshes with the gear portion 111a is provided. The rotation frame 111 rotates with respect to the frame 110 by rotating the pinion 113 by the drive motor 113a.

Top of part 111b of the rotating frame 111 to facilitate desorption of the work, and is configured to be removable. A horizontal work support frame 117 is provided below the circular rotary frame 111 so as to be movable up and down by a handle 120 and a pair of screws 118. Work push plates 121A and 121B are attached to the work support frame 117. ing. The work pressing plates 121A and 121B support and fix both sides of the work. The interval between the work pressing plates 121A and 121B is configured to be adjustable by a handle 126 and a screw 125.

  Above the work support frame 117 of the rotating frame 111, a work push screw 116 is provided for restraining the work from both above and below in cooperation with the work support frame 117.

  FIG. 18 is an explanatory diagram of a restraint adapter as a prior art attached to the rotating frame 111 described above. The constraining adapters 122A to 122E are mainly composed of face plates 123A to 123E and blocks 124A to 124E fixed to the face plates 123A to 123E, respectively. The restraint adapters 122A to 122E are fixed to the frame body 110 of the positioner by restraining with the frame 117 and the work pressing screw 116, respectively. Thus, various workpieces are mounted and fixed so as to be sandwiched between a pair of constraint adapters 122A to 122E fixed to the rotary positioner, and automatic welding using a welding torch is performed.

JP-A-5-318109

  However, it is difficult to obtain the center axis of the workpiece fixed to the positioner (hereinafter referred to as centering) in the above-described prior art, or a complicated operation using a centering device is required when obtaining the center of the workpiece. There was a problem of becoming.

  By the way, in order to widen the application range of the welding robot, it is necessary to make the welding torch enter the narrow part of the workpiece, and in order to eliminate the interference between the workpiece and the welding torch, the workpiece dimensions are accurately detected and specified. There is a need to. If the dimensional accuracy is poor, it is necessary to reduce the possibility of interference by setting a large interference margin between the welding torch and the workpiece, which narrows the application range of the robot.

  Also, when the welding torch has entered the narrow part of the workpiece, if the width from the welding torch to the workpiece ends on the left and right sides is different, the workpiece interference position on the left and right differs with respect to the vertical torch posture. When the margin of interference with the end portion is short, it may be determined that the welding torch cannot enter depending on the accuracy of the eccentricity, which causes a decrease in the application range of the welding robot.

  The present invention has been made in view of such problems, and provides a workpiece mounting jig that can be easily centered when a workpiece to be welded is fixed to a positioner, and a welding method having a wide application range using the workpiece mounting jig. For the purpose.

Workpiece mounting jig to positioner according to the present first invention includes a face plate you rotate together with the rotary frame is fixed to the rotating frame of the positioner for supporting the object to be welded, of four projecting pieces provided on the face plate constructed and block material which cross-shaped gap is formed to fit the word click therebetween of the projecting pieces, one of the projecting pieces fitted are word click on the cross-shaped gap of the block material pressed in, characterized in that organic and a fixture for fixing to said block material.

In the work mounting jig to positioner according to the present first shot bright, the fastener is, for example, a screw member can advance into the gap from the projecting piece, the word click in the gap by the screw member Is pressed and fixed to the protruding piece facing the protruding piece .

In the welding method according to the second invention of the present application, a plurality of workpieces provided with flanges at one end of a web are connected to each other by a welding torch with the other end of the web and the other end or intermediate portion of another web as a joint. In the welding method of fillet welding, the workpiece is positioned so that the temporarily fixed web of the workpiece is fitted into the gap of the workpiece mounting jig according to claim 1 or 2 to constitute a fillet joint. A step of determining whether or not the interval between the flange and the torch inserted between a pair of adjacent flanges based on the dimensions of the workpiece is greater than or equal to a predetermined value, When the interval is equal to or greater than a predetermined value, the step of allowing the torch to enter between the flanges and welding the joint ; and when the interval is less than the predetermined value, the face plate of the work attachment jig is rotated at the center of rotation. Toru After the interval is rotated around a predetermined value or more a Flat Shaft, and a step of welding the joint by entering the torch between the flange, the spacing between the torch and the flange The step of determining whether or not each of them is equal to or greater than a predetermined value includes an intersection between the rotation center point of the face plate of the work attachment jig and the web to be welded in a plane perpendicular to the rotation axis of the face plate. And a step of correcting the amount of eccentricity between the two.

In the welding method according to the second invention of the present application, when the number of joints to be welded is four and the joints are welded in a single layer or a multi-layer, the welding sequence is continuous at least partially in the adjacent joint. It is preferable not to.

  Further, in the welding method according to the third invention of the present application, when there are a plurality of joints to be welded, the presence or absence of distortion of the workpiece caused by the preceding welding process is detected, and if there is distortion, the amount of distortion is taken into account. It is preferable to determine whether or not an interval between the torch and the flange is equal to or greater than the predetermined value.

  According to the workpiece attachment jig to the positioner according to the first invention of the present application, by constraining and fixing the intersection of the web material of the SRC pillar constituted by the SRC shaft, for example, both ends of the workpiece in the cross-shaped gap, Compared to the prior art in which the flange surface on the outside of the workpiece is constrained, the centering of the workpiece is facilitated, and the welding preparation time can be shortened.

According to the workpiece attaching jig to the positioner according to claim 2 of the present application, since the fixing member is a screw member that presses and fixes the end of the workpiece within the gap, it is inserted into the gap by the screw member. A part of the workpiece can be securely fixed by coming into contact with the opposing surface forming the gap. Moreover, it can respond to the web material of various thickness by this.

According to the welding method according to the second invention of the present application, the step of determining whether or not the interval between the torch and the flange is equal to or greater than a predetermined value includes: Since it includes a step of correcting the amount of eccentricity between the intersections, it is possible to more accurately determine whether the interval is equal to or greater than a predetermined value, and between the welding torch and the flange material end. The required width can be set smaller. Therefore, the application range of this welding method is expanded.

According to the welding method according to claim 4 of the present application, when the number of joints to be welded is four and the joints are welded in a single layer or a multilayer, the welding order is at least partially adjacent joints. Therefore, the influence of workpiece deformation caused by thermal strain due to welding can be minimized.

  Further, according to the welding method according to claim 5 of the present application, when there are a plurality of joints to be welded, the presence or absence of distortion of the workpiece caused by the preceding welding process is detected, and if there is distortion, the amount of distortion is calculated. In addition, since it is determined whether or not the distance between the torch and the flange is equal to or greater than the predetermined value, it is possible to reduce the influence of workpiece thermal distortion caused by welding in the previous process.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing a workpiece attaching jig to a positioner according to the first embodiment of the present invention, and FIG. 2 is an enlarged plan view of a main part of FIG.

  1 and 2, this work mounting jig is mainly composed of a face plate 1 made of a square plate-like body and a block material 2 that forms a cross-shaped gap provided on one side of the face plate 1. . The block member 2 includes a flat base portion 3 fixed to the face plate 1, and four hook-shaped projecting pieces 4a, 4b, 4c and 4d arranged on the base portion 3 so as to form the cross-shaped gap. It is composed of

  On one of the parallel planes forming the cross-shaped gap in each of the projecting pieces 4a to 4d, a screw as a fixture for pressing and fixing the end of the workpiece fitted in the cross-shaped gap to the opposing plane Screw holes 6 for members are provided. As shown in FIGS. 4 and 5, which will be described later, the holding screw 5 as a screw member is used by being fitted into a screw hole 6 and presses and fixes the end of the workpiece against the plane of the opposing protruding piece.

  The holding screws 5 are arranged in the same direction in the planar gap portion communicating through the center portion in the cross-like gap, and a part of the work is pressed and fixed in the same direction. Therefore, the screw hole 6 is also provided in the same direction.

  Next, operation | movement of the workpiece | work attachment jig which concerns on this embodiment of such a structure is demonstrated. FIG. 3 is an explanatory view showing a state in which the workpiece mounting jig is fixed to the rotary frame 10 of the positioner of the automatic welding apparatus. In FIG. 3, the four corners of the face plate 1 of the work attachment jig 8 are fixed to a rotary frame 10 of a positioner via a fixing member 12. That is, the rotary frame 10 of the positioner is a square plate-like body, and a slit-like gap 11 is formed from the vicinity of each vertex toward the center. Each slit-like gap 11 is provided with a slidable fixing member 12 for fixing a work or a mounting jig, and the four corners of the face plate 1 of the work mounting jig 8 are rotated by the fixing member 12. 10 is fixed so as to press against the center.

  For example, an end of a T-shaped H steel or a cross-shaped H steel of an SRC shaft as a work is fixed to such a work mounting jig 8. 4 and 5 are cross-sectional views showing a state in which the T-shaped H steel and the cross-shaped H steel of the SRC shaft are mounted on the workpiece mounting jig 8.

4 and 5, the four protruding pieces 4a to form a cross-shaped gap 9 in the workpiece mounting jig 8, 4b, spacing between the opposing surfaces mutually in 4c and 4d, i.e. the gap extending in the four directions of up, down, left and right Is thicker than the thickness of the horizontal web member 13 and the vertical web member 14 in the T-shaped H steel or cross-shaped H steel of the SRC shaft as the workpiece. Therefore, when the end portion of the SRC shaft is fitted to the workpiece attachment jig 8, a gap is formed between the horizontal web material 13 or the vertical web material 14.

  At this time, the horizontal web member 13 comes into contact with the horizontal surfaces of the projecting pieces 4c and 4d on the lower side in the drawing by the weight of the work. Accordingly, the screw holes 6 are provided in the horizontal portions of the protruding pieces 4a and 4b, and the horizontal web member 13 is pressed downward and fixed by the holding screws 5 fitted into the screw holes 6.

  On the other hand, in FIG. 4, the vertical web member 14 is pressed and fixed, for example, to the anti-welding robot side on the left side in the drawing. That is, the vertical web member 14 is held in the screw hole 6 provided in the vertical member of the protruding piece 4a so as to abut on the vertical surface of the protruding piece 4b constituting the block member 2 of the workpiece mounting jig 8. 5 is pressed and fixed.

  On the other hand, also in FIG. 5, the vertical web member 14 is pressed and fixed to the left side in the drawing, for example, the anti-welding robot side. That is, the vertical web member 14 is provided on the vertical member of the projecting piece 4a and the vertical member of the projecting piece 4d so as to abut on the vertical surfaces of the projecting pieces 4b and 4c constituting the block member 2 of the workpiece mounting jig 8. They are pressed and fixed by holding screws 5 and 5 fitted into the screw holes 6.

  FIG. 6 is an explanatory view showing a state in which the SRC shaft as a work is attached to the work attachment jig 8. In FIG. 6A, the vertical web material 24 forming the T-shaped web material, which is a part of the workpiece, is pressed and fixed to the anti-welding robot side (left side in the figure) as in FIGS. However, since the flange member 25 is fixed to the front ends of the horizontal web member 23 and the vertical web member 24, the space for tightening the holding screw 5 formed on the left side of the vertical web member 24 becomes very narrow, This may cause a decrease in workability. Therefore, in order to reduce the number of holding screws 5 to be fastened in such a narrow space as much as possible, a space in which the clamping direction of the holding screws 5 in the horizontal direction is wide with the workpiece pressing direction as the anti-welding robot side (left side in the figure) is used. The vertical web member 24 has a right side in the drawing.

  On the other hand, in FIG. 6B, the vertical web member 24 forming the cross-shaped web member, which is a part of the workpiece, is pressed and fixed to the welding robot side (right side in the drawing). In FIG. 6B, since the flange member 25 is fixed to the tip portions of the horizontal web member 23 and the vertical web member 24, there is a space for tightening the holding screw 5 formed on the right side of the vertical web member 24. If the number of holding screws 5 in this space is very small, workability will be reduced. Therefore, in order to reduce the number of holding screws 5 to be fastened in such a narrow space as much as possible, a space in which the holding position of the holding screws 5 in the horizontal direction is wide with the workpiece pressing direction as the welding robot side (right side in the figure) is used. The vertical web member 24 has a left side in the figure.

  FIGS. 7A, 7B, 7C, and 7D are cross-sectional views showing the installation state of the SRC shaft on the floor. When the SRC shaft is placed on the floor surface, the SRC shaft is placed in a state where it does not fall down in consideration of balance. 7A and 7B, in the SRC shaft having the long web material 26 and the short web material 27, the long web material 26 is disposed on the floor so as to be horizontal. In this case, it is effective in terms of improving workability to lift the long web material 26 in a horizontal state and attach it to the rotary positioner. Therefore, the long web member 26 is lifted by a crane in a horizontal state and mounted on the workpiece mounting jig 8 of the positioner as it is.

  At this time, immediately before the workpiece is fitted to the workpiece mounting jig 8, the posture of the workpiece mounting jig 8 in the positioner is adjusted so that a part of the cross-shaped gap becomes horizontal. The posture of the workpiece mounting jig 8 is adjusted manually or automatically by rotating the positioner around the horizontal rotation axis, and a part of the cross-shaped gap 9 of the workpiece mounting jig 8 fixed to the positioner is horizontal and remaining. Is adjusted to be vertical. After adjusting the rotational position of the workpiece mounting jig in this way, the workpiece is picked up and mounted on the workpiece mounting jig 8.

  On the other hand, in the SRC shaft having the cross-shaped H steel having the same length of the web material 29, it is placed on the floor as shown in FIG. 7C or FIG. Even in this case, it is preferable in terms of work since it is possible to mount the work on the mounting jig without changing if it is lifted while being placed on the floor and mounted on the work mounting jig 8.

  Therefore, as described in FIGS. 7C and 7D, the workpiece is lifted by the crane while the workpiece is placed on the floor, and the workpiece is mounted immediately before the workpiece is fitted to the workpiece mounting jig of the rotary positioner. The direction of the jig 8 is adjusted. That is, when the workpiece is placed on the floor surface is X-shaped (FIG. 7C), the workpiece is placed on the floor surface so that the cross-shaped gap portion of the mounting jig is X-shaped. When the state is a cross-shaped cross section (FIG. 7D), the work mounting jig 8 is rotated by an arbitrary angle so that the cross-shaped gap portion of the mounting jig has a cross shape. The positioner is rotated manually or automatically.

  Thus, by adjusting the rotation position of the workpiece mounting jig 8 so that the workpiece can be lifted and mounted with the workpiece placed on the floor surface, it is not necessary to change the workpiece, so that workability is improved.

  In the present invention, the shape of the gap formed in the block material of the workpiece attachment jig 8 is not limited to a cross shape, and may be a plurality of radially extending gaps. That is, for example, it may be a three-forked or six-forked gap.

  Next, a welding method using a workpiece mounting jig according to a second embodiment of the present invention will be described with reference to the accompanying drawings.

In the welding method according to this embodiment, a plurality of workpieces each having a flange at one end of a web are joined to each other by a welding torch with the other end of the web and the other end or middle of another web as a joint. in the welding method of weld, and fixing the positioner so as to form a fillet joint and temporarily fixed the weather blanking the workpiece fitted into the gap of the above-mentioned workpiece mounting jig, the dimensions of the workpiece And determining whether or not the interval between the torch inserted between a pair of adjacent flanges and the flange is equal to or greater than a predetermined value, and when the interval is equal to or greater than the predetermined value, A step of welding a joint by inserting a torch between the flanges, and rotating the face plate of the work attachment jig about a horizontal axis passing through a rotation center point when the interval is less than a predetermined value. while After a predetermined value or more, and a step of welding the joint by entering the torch between the flange, whether the distance between the torch and its flange is respectively greater than a predetermined value The step of determining the amount of eccentricity between the rotation center point of the face plate of the work mounting jig and the intersection between the webs to be welded in a plane perpendicular to the rotation axis of the face plate. Is included.

  The automatic welding apparatus used in the present embodiment includes, for example, a welding torch, a positioner for fixing a workpiece, a workpiece fixing jig having a cross-shaped gap, and a central processing unit (CPU) to which data such as workpiece dimensions are input. ) And the input data, it is determined whether or not the distance between the welding torch and the flange is equal to or greater than a predetermined value. Based on the determination result, the rotation amount of the positioner with the workpiece fixed is calculated and supported by the rotation drive unit. And a determination unit that provides

  FIG. 8 is an explanatory diagram showing the positional relationship between the SRC shaft 20 that is the material to be welded and the welding torch 33 in this embodiment. In FIG. 8, the SRC shaft 20 as a material to be welded is mainly composed of a web material 31 and a flange material 32 fixed to each end of the web material 31. Both ends of such an SRC shaft are mounted on workpiece mounting jigs 8 fixed to a pair of rotating frames of a rotating positioner (not shown). The workpiece attachment jig 8 is represented by protruding pieces 4a, 4b, 4c and 4d in the figure.

  In FIG. 8, in order to ensure the accuracy of the bead shape, the rotational position of the workpiece mounting jig 8 is adjusted so that the attitude of the welding torch 33 faces downward. It is arranged at a position where the interval between the adjacent flange members 32 is released upward with the weld joint 53 interposed therebetween, so that the angle formed by the welding torch 33 and the two web members 31 is about 45 degrees. The positioner angle, that is, the rotational position of the workpiece mounting jig 8 is adjusted. As a result, the distance between the welding torch 33 and the two flange members 32 adjacent to the welding torch 33 becomes substantially the same, and interference between the welding torch 33 and the workpiece is easily avoided. At this time, the weld line is horizontal.

  Next, the work positioning angle determination method will be described in detail with reference to FIGS. When workpiece dimension data or the like is input to the CPU (not shown) by the operator, the calculation unit 51 and the determination unit 52 in FIG. 9 are arranged between the welding torch 33 and the flange members 32 and 32 that are part of the workpiece 20. It is determined whether or not the interval is greater than or equal to a predetermined value, and when there is a possibility of interference, necessary measures are taken to eliminate this.

In the present embodiment, since the center of rotation of the heart and the workpiece mounting jig 8 in the workpiece 20 do not match, than ignoring the eccentric amount between the flange member 32 of the welding torch 33 and the workpiece 20 The gap between the welding torch 33 and the workpiece 20 cannot be effectively avoided.

  Therefore, first, the amount of eccentricity between the center point 36 of the workpiece 20 and the center point 35 of rotation of the workpiece mounting member 8 is accurately obtained, and the amount of eccentricity is corrected.

  The amount of eccentricity between the center point 36 of the workpiece 20 and the center point 35 of rotation of the workpiece mounting member 8 is obtained as follows. FIG. 11 is an explanatory diagram showing a data input screen in the steel SRC shaft welding system according to the present embodiment. In FIG. 11, the operator first inputs the size of the workpiece cross section to be welded.

  Specifically, for example, 800 is input as the panel vertical diameter and the panel horizontal diameter in the cross-sectional shape of the cross column (SRC shaft) to be welded, and the horizontal direction is set as the direction of the H steel, and the T bar is mounted vertically. input. Next, the operator inputs, for example, “←” on the anti-welding robot side as the pressing direction when fixing the web material to the workpiece attachment jig 8.

  The distance between the protruding pieces forming the cross-shaped gap in the workpiece mounting jig 8 and the plate thickness of the web material on the SRC shaft that is the material to be welded are, for example, input in advance to the data input device. A center point 36 of the workpiece 20 is calculated based on the input data.

  Next, the amount of eccentricity between the workpiece center point 36 and the rotation center point 35 of the workpiece attachment jig 8 is obtained, and the workpiece is centered on the rotation center point 35 of the workpiece attachment jig 8 instead of the workpiece center point 36. Whether or not the interval between the first flange and the second flange adjacent to the first flange 20 and the welding torch 33 when rotating 20 is greater than or equal to a predetermined interval sufficient to allow the welding torch 33 to enter is as follows. Detect and judge.

  That is, in the calculation unit 51 of FIG. 9, according to the block diagram of FIG. 9, the welding position (joint) 53 and the end of the flange member 32A in FIG. The angle θf1 between the straight line connecting the web material 31A and the web material 31B, and the angle θf2 between the straight line connecting the welding position 53 and the end of the flange material 32B and the web material 31B are obtained.

  Next, the angles θa1 and θa2 corresponding to the width dimension a are obtained based on the width dimension a from the flange end necessary for the welding torch 33 to enter, and the flange 32A is avoided from these θf1, θa1, θf2, and θa2, respectively. For determining the angle α and the angle β for avoiding the flange 32B.

  Next, the determination unit 52 in FIG. 9 compares the angle α and the angle β obtained by the calculation unit 51 according to the block diagram in FIG. 9, and whether or not there is a possibility of interference between the welding torch 33 and the flange member 32. When there is a possibility of interference, a necessary instruction is given to a rotary shaft drive device (motor) (not shown). That is, when the angle α is equal to or smaller than the angle β, the positioning of the two web members 31A and 31B is performed on the condition that the workpiece positioning angle γ for the downward welding is between the angle α and the angle β. The rotation amount θ in the counterclockwise direction in FIG. 10 for performing is determined as γ, and the signal is sent to the motor. Upon receiving the signal, the motor rotates the work mounting jig 8 according to the instruction, and the cross pillar rotates along with this rotation, so that a necessary upward space is formed between the flanges 32A and 32B. The welding torch 33 enters the space portion in an appropriate posture, and a cross pillar is formed by fillet welding (FIG. 9A).

  Next, the cross is made on condition that the angle α is equal to or smaller than the angle β, the workpiece positioning angle γ for the downward welding is not between the angles α and β, and the angle γ is smaller than the angle α. The counterclockwise rotation amount θ in FIG. 10 for positioning the column is determined to be α (FIG. 9B), the signal is sent to the motor, and the cross column is rotated by the rotation of the workpiece mounting jig 8. Thereafter, a cross pillar is formed in the same manner.

  Next, in order to position the cross column on the condition that the angle α is equal to or smaller than the angle β, γ is not between the angles α and β, and the angle γ is not smaller than the angle α. The rotation amount θ in the counterclockwise direction in FIG. 10 is determined as β (FIG. 9C), a signal for that is sent to the motor, and the cross pillar is welded in the same manner.

  When the angle α is larger than the angle β, it is determined that the welding torch 33 cannot enter the weld joint 53, and the work for forming the cross column is stopped (FIG. 9D). At this time, welding of the weld joint 53 is performed manually after the next step.

  According to the present embodiment, the workpiece mounting jig 8 having a cross-shaped gap is fixed to the rotary frame 10 of the rotary positioner, and the SRC shaft 20 that is a material to be welded is fixed using the workpiece mounting jig 8. Therefore, the centering of the workpiece is facilitated as compared with the conventional method in which the outer flange surface of the workpiece 20 is constrained. Therefore, the welding preparation process can be simplified and the welding preparation time can be shortened.

  Further, according to the present embodiment, the center point of the workpiece mounting jig 8 is caused by the difference between the width of the cross-shaped gap of the workpiece mounting jig 8 and the thickness of the web material of the SRC shaft 20 which is the workpiece. Although the center point of the workpiece is eccentric, the amount of eccentricity is obtained and corrected, and the actual gap between the welding torch 33 and the flange member 32 can be accurately obtained. Therefore, the required distance between the welding robot and the welding robot can be minimized.

  At this time, even if the accurate eccentric amount is not actually measured, the eccentric amount is automatically calculated and corrected only by inputting the workpiece thickness and the workpiece pressing direction in the workpiece mounting jig 8, etc. The scope of application becomes wider. The required distance between the welding torch 33 and the end of the flange member 32 is, for example, 20 mm, and the dimension does not correct the eccentricity between the center point 36 of the workpiece 20 and the rotation center point 35 of the workpiece mounting jig 8. It can be made narrower than, for example, 40 mm in the prior art with low accuracy.

  Further, according to the present embodiment, the work mounting jig 8 is attached to the rotary frame 10 of the positioner, and a part of the work is fitted into the cross-shaped gap 9 of the work mounting jig 8 so as to be supported and fixed. As a result, the deflection of the SRC shaft can be reduced.

  FIGS. 12A to 12C are explanatory views showing the effect of reducing the deflection of the SRC shaft in the present embodiment. In FIG. 12A, the contact portion between the workpiece mounting jig 8 and the SRC shaft 20 in the present embodiment is a plane having a predetermined area. That is, in the present embodiment in which the both ends of the SRC shaft are not supported by points but are supported by surfaces, the deflection amount of the SRC shaft is, for example, as shown in FIG. 12B, and the point contact shown in FIG. Compared to the conventional technology supported by the above, there is an effect of reducing the amount of bending.

  Moreover, according to the welding method of the SRC shaft according to the present embodiment, the crossing portion of the through diaphragm and the flange is formed by using a workpiece attachment jig having a cross-shaped or radial gap portion 9 at the rotation center portion. It can apply to welding of the SRC pillar which has.

  FIG. 13 is a perspective view showing an SRC column in which a crossing portion of the through diaphragm 55 and the flange member 56 becomes a welded joint 53. The SRC pillar is composed of an SRC shaft and a joint, and the SRC pillar of FIG. 13 is composed of four SRC shafts 57 and three joints 58. Since the SRC shaft 57 has a portion where the web material 59 intersects in a cross shape at the center along the length direction thereof, it can be easily centered by inserting and fixing this portion into the cross-shaped gap of the workpiece mounting jig. The preparation time until the start of welding can be shortened.

  When welding column cores, pipe cores, etc. other than the SRC shaft, for example, remove the work attachment jig from the rotary frame of the positioner, and directly clamp and weld the outer surface of the work with the rotary frame. Can do.

  FIG. 14 is a view showing a state in which the column core 60 is directly attached as another workpiece by removing the mounting jig 8 for the SRC shaft from the rotary frame 10 of the rotary positioner. In this way, the workpiece attachment jig can be removed and the workpiece can be directly attached to the rotating frame and welded.

  Next, a modification of the welding method according to the third embodiment of the present invention will be described. FIG. 15 is a view showing a cross section of an SRC shaft (cross-shaped column) as a material to be welded. In FIG. 15, the weld joint is a contact line between the web members 41, and there are, for example, four locations. In this case, at least a part of the welding order is not continuous with adjacent joints. For example, in FIG. 15A, first, the joint 43 at the upper part of 47 in FIG. Then, the work attachment jig 8 is rotated to weld the lower joint 44 (2), then, for example, the left joint 45 is welded (3), and finally the right joint 46 is welded. (4). Thereby, the influence of distortion of the workpiece 40 due to welding heat can be reduced.

  In addition, when multi-layer welding is performed on the plurality of joints, as described above, one-pass welding is performed in the order of the joints 43, 44, 45, and 46, and the first-pass welding is performed on all the joints. Thereafter, the second pass is performed in the order of the joints 43, 44, 45 and 46 ((5), (6), (7), (8)). By performing multi-layer welding as described above, it is possible to reduce the influence of the deformation of the work due to the distortion of the work caused by the welding heat, and perform accurate welding as described above.

  In the present embodiment, the welding order of the joints is not particularly limited as long as it is an order that can alleviate the thermal strain of the workpiece caused by welding heat. In addition, in the method of performing multilayer prime welding continuously on the next joint after continuously performing multilayer prime welding on one joint, as shown in FIG. The deformation of the workpiece due to the influence becomes large, and the distortion prevention band inserted to prevent distortion may be damaged, and accurate welding cannot be performed.

  In this embodiment, considering the deformation of the work due to thermal strain, the gap between the flange ends is detected before welding, the presence or absence of strain due to welding heat in the welding of the preceding process is detected, and if there is strain In consideration of the distortion, it can be determined whether or not the distance between the torch and the flange is equal to or greater than a predetermined value. As a result, interference between the welding torch and the workpiece can be reliably avoided.

  FIG. 16 is an explanatory view showing a welding method for obtaining the distortion of the workpiece caused by the welding heat of the welding in the previous step, correcting the workpiece, and performing the next welding. In FIG. 16, when the upper left web member 41 constituting the SRC shaft is displaced upward due to the welding in the preceding process, this displacement amount is detected by, for example, touch sensing, for example, 1 / of the displacement amount. 2, the distance between the welding torch 33 and the ends of the flange members 42 on the left and right sides becomes equal, and the interference between the welding torch 33 and the flange member 42 is achieved. It becomes easy to avoid. Note that when the necessary gap between the welding torch 33 and the flange member 42 cannot be secured due to the deformation of the web member 41, the automatic welding is stopped and manual welding is performed in the subsequent steps.

  The workpiece mounting jig and the welding method using the same according to the present invention, in which the workpiece centering is easy and the eccentricity between the center of the workpiece and the center of the workpiece mounting jig can be easily corrected, It is useful in the field of welding of SRC shafts and SRC columns.

It is a perspective view of the workpiece attachment jig which concerns on 1st Embodiment of this invention. It is a principal part enlarged plan view of the workpiece attachment jig which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the attachment state to the positioner of a workpiece attachment jig. It is a figure which shows the workpiece fixing method in a workpiece attachment jig. It is a figure which shows the workpiece fixing method in a workpiece attachment jig. It is a figure which shows the workpiece fixing method in a workpiece attachment jig. It is a figure which shows the relationship between a workpiece | work lifting direction and a workpiece | work fixing method. It is a figure which shows the welding method which concerns on 2nd Embodiment of this invention. It is explanatory drawing which shows the rotation angle determination method of a workpiece | work attachment jig. It is explanatory drawing which shows the rotation angle determination method of a workpiece | work attachment jig. It is a figure which shows the data input screen in embodiment of this invention. It is a figure which shows the effect of a workpiece attachment jig. It is a perspective view which shows the SRC pillar which has a crossing part of a through diaphragm and a flange. It is a figure which shows the rotating frame of the positioner which removed the workpiece | work attachment jig and attached the column core directly. It is a figure which shows the welding order in the case of multiple pile welding in this invention. It is a figure which shows the welding method which considered the distortion of the workpiece | work by the welding heat of this invention. It is explanatory drawing which shows a prior art. It is explanatory drawing which shows a prior art.

Explanation of symbols

1: Face plate 2: Block material 3: Base portions 4a to 4d: Protruding piece 5: Holding screw (screw member)
6: Screw hole 8: Work attachment jig 9: Cross-shaped gap 10: Rotating frame 11: Slit-shaped gap 12: Fixing member 13: Horizontal web material 14: Vertical web material 20: Workpiece (SRC shaft)
23: horizontal web material 24: vertical web material 25: flange material 26: long web material 27: short web material 28: arrow indicating the lifting direction 29: web material 31: web material 32: flange material 33: welding torch 35: rotation Center point 36: workpiece center point 40: workpiece 41: web material 42: flange material 43-46: joint 47: intersection point of web material 51: calculation unit 52: determination unit 53: welded joint 55: through diaphragm 56: flange material 57: SRC shaft 58: joint 59: web material 60: column core 110: frame 111: rotating frame 111b: part of rotating frame 112: gear portion 113: pinion 113a: drive motor 116: work pressing screw 117: work Support frame 118: Screw 120: Handle 121A, 121B: Work pressing plate 122A-122E: Constraint Adapter 123A~123E: face plate 124A~124E: block

Claims (5)

  A cross-shaped plate that is fixed to a rotating frame of a positioner that supports an object to be welded and that rotates together with the rotating frame, and four projecting pieces provided on the face plate. And a fixing member that presses a workpiece fitted into the cross-shaped gap of the block material against one of the protruding pieces and fixes the block material to the block material. A workpiece attachment jig to the positioner characterized by The fixing tool is a screw member that can advance into the gap from the protruding piece, and the workpiece is pressed and fixed to the protruding piece that faces the protruding piece in the gap by the screw member. The work attachment jig to the positioner according to claim 1 .   In a welding method in which a plurality of workpieces each having a flange at one end of a web are welded to each other with a welding torch using the other end of the web and the other end or intermediate portion of another web as a joint, temporarily fixed. A step of fitting the workpiece web so as to form a fillet joint in the gap of the workpiece attachment jig according to claim 1 or 2 to fix the workpiece to a positioner, and a dimension of the workpiece And determining whether or not the interval between the torch inserted between a pair of adjacent flanges and the flange is equal to or greater than a predetermined value, and when the interval is equal to or greater than the predetermined value, A step of welding a joint by inserting a torch between the flanges, and rotating the face plate of the work attachment jig about a horizontal axis passing through the center of rotation when the interval is less than a predetermined value. After the interval is set to a predetermined value or more, the step of causing the torch to enter between the flanges and welding the joint, and whether each interval between the torch and the flange is a predetermined value or more The step of determining whether or not the step of correcting the eccentricity between the rotation center point of the face plate of the work mounting jig and the intersection between the webs to be welded in a plane perpendicular to the rotation axis of the face plate The welding method characterized by including.   When the number of joints to be welded is four or more and the joints are welded in a single layer or a multilayer, the welding order is such that at least part of adjacent joints is not continuous. The welding method according to claim 3.   When there are a plurality of joints to be welded, the presence or absence of distortion of the workpiece caused by the preceding welding process is detected. If there is distortion, the amount of distortion is taken into account and the distance between the torch and the flange is the predetermined value. It is determined whether it is above, The welding method of Claim 3 or 4 characterized by the above-mentioned.

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